TM 9-285 Shotguns, All Types 1942-09-21
"This manual contains in brief the available information necessary for the identification, operation, care, and cleaning of the shotguns listed below. In addition is included the disassembly and assembly of the guns for the purpose of cleaning and lubrication, and available information on ammunition."
Digitized by AHEC (U.S. Army Heritage Collections) http://www.carlisle.army.mil/ahec/